"1. Single one crawling - enhanced photo so you can see the spines and the "saddleback". Note: the larger end is the head. It has the extra two spikes. The tail end has the fake white eye spots - these are to attract predators to the wrong end of the caterpillar; most likely so they'll get stung before doing much damage."
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Saddleback Caterpillar Moth (Sibine stimulea)